1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
|
/* $OpenBSD: isadma.c,v 1.6 1996/05/07 07:37:10 deraadt Exp $ */
/* $NetBSD: isadma.c,v 1.19 1996/04/29 20:03:26 christos Exp $ */
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/file.h>
#include <sys/buf.h>
#include <sys/syslog.h>
#include <sys/malloc.h>
#include <sys/uio.h>
#include <vm/vm.h>
#include <machine/pio.h>
#include <dev/isa/isareg.h>
#include <dev/isa/isadmavar.h>
#include <dev/isa/isadmareg.h>
struct dma_info {
int flags;
int active;
caddr_t addr;
vm_size_t nbytes;
struct isadma_seg phys[1];
};
static struct dma_info dma_info[8];
static u_int8_t dma_finished;
/* high byte of address is stored in this port for i-th dma channel */
static int dmapageport[2][4] = {
{0x87, 0x83, 0x81, 0x82},
{0x8f, 0x8b, 0x89, 0x8a}
};
static u_int8_t dmamode[4] = {
DMA37MD_READ | DMA37MD_SINGLE,
DMA37MD_WRITE | DMA37MD_SINGLE,
DMA37MD_READ | DMA37MD_LOOP,
DMA37MD_WRITE | DMA37MD_LOOP
};
/*
* isadma_cascade(): program 8237 DMA controller channel to accept
* external dma control by a board.
*/
void
isadma_cascade(chan)
int chan;
{
#ifdef ISADMA_DEBUG
if (chan < 0 || chan > 7)
panic("isadma_cascade: impossible request");
#endif
/* set dma channel mode, and set dma channel mode */
if ((chan & 4) == 0) {
outb(DMA1_MODE, chan | DMA37MD_CASCADE);
outb(DMA1_SMSK, chan);
} else {
chan &= 3;
outb(DMA2_MODE, chan | DMA37MD_CASCADE);
outb(DMA2_SMSK, chan);
}
}
/*
* isadma_start(): program 8237 DMA controller channel, avoid page alignment
* problems by using a bounce buffer.
*/
void
isadma_start(addr, nbytes, chan, flags)
caddr_t addr;
vm_size_t nbytes;
int chan;
int flags;
{
struct dma_info *di;
int waport;
int mflags;
vm_size_t size;
#ifdef ISADMA_DEBUG
if (chan < 0 || chan > 7 ||
(((flags & DMAMODE_READ) != 0) + ((flags & DMAMODE_WRITE) != 0) +
((flags & DMAMODE_LOOP) != 0) != 1) ||
((chan & 4) ? (nbytes >= (1<<17) || nbytes & 1 || (u_int)addr & 1) :
(nbytes >= (1<<16))))
panic("isadma_start: impossible request");
#endif
di = dma_info+chan;
if (di->active) {
log(LOG_ERR,"isadma_start: old request active on %d\n",chan);
isadma_abort(chan);
}
di->flags = flags;
di->active = 1;
di->addr = addr;
di->nbytes = nbytes;
mflags = ISADMA_MAP_WAITOK | ISADMA_MAP_BOUNCE | ISADMA_MAP_CONTIG;
mflags |= (chan & 4) ? ISADMA_MAP_16BIT : ISADMA_MAP_8BIT;
if (isadma_map(addr, nbytes, di->phys, mflags) != 1)
panic("isadma_start: cannot map");
/* XXX Will this do what we want with DMAMODE_LOOP? */
if ((flags & DMAMODE_READ) == 0)
isadma_copytobuf(addr, nbytes, 1, di->phys);
dma_finished &= ~(1 << chan);
if ((chan & 4) == 0) {
/*
* Program one of DMA channels 0..3. These are
* byte mode channels.
*/
/* set dma channel mode, and reset address ff */
outb(DMA1_MODE, chan | dmamode[flags]);
outb(DMA1_FFC, 0);
/* send start address */
waport = DMA1_CHN(chan);
outb(dmapageport[0][chan], di->phys[0].addr>>16);
outb(waport, di->phys[0].addr);
outb(waport, di->phys[0].addr>>8);
/* send count */
outb(waport + 1, --nbytes);
outb(waport + 1, nbytes>>8);
/* unmask channel */
outb(DMA1_SMSK, chan | DMA37SM_CLEAR);
} else {
/*
* Program one of DMA channels 4..7. These are
* word mode channels.
*/
/* set dma channel mode, and reset address ff */
outb(DMA2_MODE, (chan & 3) | dmamode[flags]);
outb(DMA2_FFC, 0);
/* send start address */
waport = DMA2_CHN(chan & 3);
outb(dmapageport[1][chan], di->phys[0].addr>>16);
outb(waport, di->phys[0].addr>>1);
outb(waport, di->phys[0].addr>>9);
/* send count */
nbytes >>= 1;
outb(waport + 2, --nbytes);
outb(waport + 2, nbytes>>8);
/* unmask channel */
outb(DMA2_SMSK, (chan & 3) | DMA37SM_CLEAR);
}
}
void
isadma_abort(chan)
int chan;
{
struct dma_info *di;
#ifdef ISADMA_DEBUG
if (chan < 0 || chan > 7)
panic("isadma_abort: impossible request");
#endif
di = dma_info+chan;
if (! di->active) {
log(LOG_ERR,"isadma_abort: no request active on %d\n",chan);
return;
}
/* mask channel */
if ((chan & 4) == 0)
outb(DMA1_SMSK, DMA37SM_SET | chan);
else
outb(DMA2_SMSK, DMA37SM_SET | (chan & 3));
isadma_unmap(di->addr, di->nbytes, 1, di->phys);
di->active = 0;
}
int
isadma_finished(chan)
int chan;
{
#ifdef ISADMA_DEBUG
if (chan < 0 || chan > 7)
panic("isadma_finished: impossible request");
#endif
/* check that the terminal count was reached */
if ((chan & 4) == 0)
dma_finished |= inb(DMA1_SR) & 0x0f;
else
dma_finished |= (inb(DMA2_SR) & 0x0f) << 4;
return ((dma_finished & (1 << chan)) != 0);
}
void
isadma_done(chan)
int chan;
{
struct dma_info *di;
u_char tc;
#ifdef DIAGNOSTIC
if (chan < 0 || chan > 7)
panic("isadma_done: impossible request");
#endif
di = dma_info+chan;
if (! di->active) {
log(LOG_ERR,"isadma_done: no request active on %d\n",chan);
return;
}
/* check that the terminal count was reached */
if ((chan & 4) == 0)
tc = inb(DMA1_SR) & (1 << chan);
else
tc = inb(DMA2_SR) & (1 << (chan & 3));
if (tc == 0)
/* XXX probably should panic or something */
log(LOG_ERR, "dma channel %d not finished\n", chan);
/* mask channel */
if ((chan & 4) == 0)
outb(DMA1_SMSK, DMA37SM_SET | chan);
else
outb(DMA2_SMSK, DMA37SM_SET | (chan & 3));
/* XXX Will this do what we want with DMAMODE_LOOP? */
if (di->flags & DMAMODE_READ)
isadma_copyfrombuf(di->addr, di->nbytes, 1, di->phys);
isadma_unmap(di->addr, di->nbytes, 1, di->phys);
di->active = 0;
}
|
